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So then the trick is to forgo internet by disconnecting power from a few minutes before that time to the middle of the night and get power back? I do feel for the ISP's with this setup because the right thing to do would be to write in the installation manual: "Only install in the deep of night".

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Well they could 1) renew the IP before it expires or 2) reboot the modem remotely at 3:30am for example.

Or assign a lease that expires at 0330 instead of a lease that expires in 24 hours.

But I’ve not experienced similar in 20 years of dynamic ips.

it depends. depending on the dhcp implementation on the server side you may have the same problem (ie while you get a new lease it may expire at the same time). unlikely but I’ve seen some stuff when it comes to dhcp

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